The Avengers #4: The Yaffa edition

Page Publications' The Avengers #4 was published c.October 1979:

The cover is a recoloured and cropped from Marvel Comics' The Avengers #10:

The contents:

[The Avengers Break Up!], originally published in The Avengers #10, November 1964

The Mighty Avengers Meet Spider-Man!, originally published in The Avengers #11, December 1964

This Hostage Earth!, originally published in The Avengers #12 ,January 1965 

The printing of The Avengers Break Up! is missing the the splash page, but is otherwise intact. The other two stories are intact, barring some deletions to in-story references to other Marvel Comics issues. The inner rear cover and rear cover were required to complete the reprinting of This Hostage Earth!